Can any doc tell me what's the best toothpaste for sensitive teeth?

Depends: There are variables between different people on which toothpaste works best for them. Sometimes it's a prescription Fluoride toothpaste that works best. You need to see a dentist to determine if the sensitivity is from gum recession and exposed roots, or if it's failing fillings or cavities. If it's failing fillings, then you need to have the fillings redone.